基于相关性的FBMC-OQAM信号的符号周期盲估计

针对滤波器组多载波(filter bank multi-carrier,FBMC)信号的符号周期的盲估计问题,提出了自相关二阶矩和循环自相关算法。首先通过滤波器组多载波的交错正交幅度调制(FBMC-offset quadrature amplitude modulation,FBMC-OQAM)信号的自相关二阶矩特性,估计出该信号的符号周期;然后根据FBMC-OQAM信号的循环自相关在循环频率α=0切面具有离散谱线特征进行符号周期估计;最后对符号周期估计算法进行性能比较。仿真结果表明,在低信噪比下,两种算法均能有效实现FBMC-OQAM信号的符号周期估计。

Symbol period blind estimation of FBMC OQAM signals based on correlation

In order to solve the problem of estimating the symbol rate of filter bank multi carrier (FBMC), this paper proposes a second order moment of autocorrelation and cyclic autocorrelation algorithm. The symbol period of the signal is estimated by the autocorrelation second order moment characteristic of the FBMC offset quadrature amplitude modulation (OQAM) signal.Then, according to the cyclic autocorrelation of the FBMC OQAM signal, the cycle frequency α=0 map has discrete spectral line features for the symbol period estimation. Finally, the performance of the symbol period estimation algorithm is compared. The simulation results show that under a low signal to noise ratio, both algorithms can effectively realize the symbol period estimation of the FBMC OQAM signal.